Title :
Limited feedback scheme based on zero-forcing precoding for multiuser MIMO-OFDM downlink systems
Author :
Chen, Zhiyong ; Wang, Wenbo ; Peng, Mugen ; Cao, Fengming
Author_Institution :
Key Lab. of Universal Wireless Commun. for Minist. of Educ., Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
Conventional zero-forcing precoding was well investigated, but it hadn´t considered the channel quality indicator (CQI) mismatch for practical system with limited feedback. This paper studies a novel zero-forcing precoding with channel quality indicator (CQI) estimation and adjusting, channel directional information(CDI) quantization, user scheduling and link adaptation and then proposes a CQI estimation algorithm for multiuser multiple input multiple output antenna (MU-MIMO) downlink systems with limited feedback. Simulation with 3GPP long term evolution system demonstrates that the scheme with proposed method can significantly improve system performance, compared with conventional zero-forcing precoding and single user MIMO systems.
Keywords :
MIMO communication; OFDM modulation; antenna arrays; precoding; 3GPP; CQI estimation; MU-MIMO system; channel directional information quantization; channel quality indicator mismatch; limited feedback scheme; multiuser MIMO-OFDM downlink systems; multiuser multiple input multiple output antenna; orthogonal frequency division multiplexing; zero-forcing precoding; Adaptive arrays; Antenna feeds; Directive antennas; Downlink; Long Term Evolution; MIMO; Output feedback; Quantization; Scheduling algorithm; System performance; CDI; CQI; MMSE; MU-MIMO; Zero-forcing precoding;
Conference_Titel :
Wireless Internet Conference (WICON), 2010 The 5th Annual ICST
Conference_Location :
Singapore
Electronic_ISBN :
978-963-9799-86-8
